.nav{
    width: 500px;
    height: 50px;;
    background: #F8F8F8;
    border-radius: 3px;
    margin: 0 auto;
    border:1px solid #ADADAD;
    margin-top: 30px;
   position: absolute;
    left: 30%;
    right:30%;
    z-index: 3;
}
.cont{
    float: left;
    font-size: 25px;
    line-height: 45px;
    padding-left: 30px;
}
.nav4{
    width: 500px;
    height: 50px;;
    background: #E6E6E6;
    border-radius: 3px;
    margin: 0 auto;
    border:1px solid #ADADAD;
    margin-top: 30px;
    box-shadow:-1px 1px 12px #999 inset;
  position: absolute;
    left: 30%;
    right:30%;
    z-index: 3;
}
.nav2{
    width: 500px;
    height: 800px;;
    background: #F8F8F8;
    border-radius: 3px;
    margin: 0 auto;
    border:1px solid #ADADAD;
    animation: 0.8s danru;
    box-shadow: #ADADAD 0 2px 10px;
    position: absolute;
    top:10%;
    left: 30%;
    right:30%;
    z-index: 3;
 }
.nav3{
    width: 500px;
    height: 800px;;
    background: #F8F8F8;
    border-radius: 3px;
    margin: 0 auto;
    border:1px solid #ADADAD;
    animation: 0.5s danru2;
    display: none;
    position: absolute;
    top:10%;
    left: 30%;
    right:30%;
    z-index: 3;
}
.nav:hover{
    background: #E6E6E6;

}
.inp{
    width: 90% !important;
    height: 5% !important;
    margin: 0 auto;
    margin-top: 20px;
    display: block;
    font-size: 26px !important;
    padding-left: 20px !important;
}
.ul{
    position: relative;
    padding-left: 20px;
    width: 100%;
    height: 60px;
    font-size: 24px;
    padding-top: 20px;
    color: #777777;
    margin-bottom: 150px;
}
li{
    display: inline-block;
    width: 100%;
    height: 40px;;
    padding-left: 50px;
    list-style: none;
    color:#333333;
}
li:hover{
    background: #F1F1F2;
}
@keyframes danru {
    0%{
        opacity: 0.25;
    }
    25%{
        opacity: 0.5;
    }
   50%{
        opacity: 0.75;
    }
    100%{
        opacity: 1;
    }
}
@keyframes danru2 {
    0%{
        opacity: 1;
    }
    25%{
        opacity: 0.6;
    }
   50%{
        opacity: 0.3;
    }
    100%{
        opacity: 0;
    }
}
.la{
    width: 20px;;
    margin-left: 90%;
    margin-top: 2%;
    font-size: 25px;
}
.dian{
    position: absolute;
    right: 20px;;
    display: none
}
.dian2{
     position: absolute;
    right: 20px;;
    display: inline-block
}
.dian3{
    margin-top: 10px;
    display: block;
}